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                  <p class="p_Heading1"><span class="f_Heading1">VHDL Conventions</span></p>



  
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                <p class="p_BodyText"><span class="f_BodyText">Enterprise Architect supports round-trip engineering of VHDL, where the following conventions are used. </span></p>
<p class="p_SubHeadingL1"><span class="f_SubHeadingL1">Stereotypes</span></p>
<div style="text-align: left; text-indent: 0px; padding: 0px 0px 0px 0px; margin: 5px 0px 5px 13px;"><table cellspacing="0" cellpadding="0" border="0" style="border: none; border-spacing:0px; border-collapse: collapse;">
<tr style="text-align:left;vertical-align:top;">
<td valign="top" width="120" bgcolor="#e3e6ed" style="width:120px; background-color:#e3e6ed; border: solid 1px #000000;"><p class="p_Tableheader"><span class="f_Tableheader">Stereotype</span></p>
</td>
<td valign="top" width="109" bgcolor="#e3e6ed" style="width:109px; background-color:#e3e6ed; border: solid 1px #000000;"><p class="p_Tableheader"><span class="f_Tableheader">Applies To</span></p>
</td>
<td valign="top" width="379" bgcolor="#e3e6ed" style="width:379px; background-color:#e3e6ed; border: solid 1px #000000;"><p class="p_Tableheader"><span class="f_Tableheader">Corresponds To</span></p>
</td>
</tr>
<tr style="text-align:left;vertical-align:top;">
<td valign="top" width="120" style="width:120px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext" style="font-weight: bold;">architecture</span></p>
</td>
<td valign="top" width="109" style="width:109px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">Class</span></p>
</td>
<td valign="top" width="379" style="width:379px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">An architecture.</span></p>
</td>
</tr>
<tr style="text-align:left;vertical-align:top;">
<td valign="top" width="120" style="width:120px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext" style="font-weight: bold;">asynchronous</span></p>
</td>
<td valign="top" width="109" style="width:109px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">Method</span></p>
</td>
<td valign="top" width="379" style="width:379px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">An asynchronous process.</span></p>
</td>
</tr>
<tr style="text-align:left;vertical-align:top;">
<td valign="top" width="120" style="width:120px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext" style="font-weight: bold;">configuration</span></p>
</td>
<td valign="top" width="109" style="width:109px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">Method</span></p>
</td>
<td valign="top" width="379" style="width:379px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">A configuration.</span></p>
</td>
</tr>
<tr style="text-align:left;vertical-align:top;">
<td valign="top" width="120" style="width:120px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext" style="font-weight: bold;">enumeration</span></p>
</td>
<td valign="top" width="109" style="width:109px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">Inner Class</span></p>
</td>
<td valign="top" width="379" style="width:379px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">An </span><span class="f_Tabletext" style="font-style: italic;">enum</span><span class="f_Tabletext"> type.</span></p>
</td>
</tr>
<tr style="text-align:left;vertical-align:top;">
<td valign="top" width="120" style="width:120px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext" style="font-weight: bold;">entity</span></p>
</td>
<td valign="top" width="109" style="width:109px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">Interface</span></p>
</td>
<td valign="top" width="379" style="width:379px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">An entity.</span></p>
</td>
</tr>
<tr style="text-align:left;vertical-align:top;">
<td valign="top" width="120" style="width:120px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext" style="font-weight: bold;">part</span></p>
</td>
<td valign="top" width="109" style="width:109px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">Attribute</span></p>
</td>
<td valign="top" width="379" style="width:379px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">A component instantiation.</span></p>
</td>
</tr>
<tr style="text-align:left;vertical-align:top;">
<td valign="top" width="120" style="width:120px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext" style="font-weight: bold;">port</span></p>
</td>
<td valign="top" width="109" style="width:109px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">Attribute</span></p>
</td>
<td valign="top" width="379" style="width:379px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">A port.</span></p>
</td>
</tr>
<tr style="text-align:left;vertical-align:top;">
<td valign="top" width="120" style="width:120px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext" style="font-weight: bold;">signal</span></p>
</td>
<td valign="top" width="109" style="width:109px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">Attribute</span></p>
</td>
<td valign="top" width="379" style="width:379px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">A signal declaration.</span></p>
</td>
</tr>
<tr style="text-align:left;vertical-align:top;">
<td valign="top" width="120" style="width:120px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext" style="font-weight: bold;">struct</span></p>
</td>
<td valign="top" width="109" style="width:109px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">Inner Class</span></p>
</td>
<td valign="top" width="379" style="width:379px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">A record definition.</span></p>
</td>
</tr>
<tr style="text-align:left;vertical-align:top;">
<td valign="top" width="120" style="width:120px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext" style="font-weight: bold;">synchronous</span></p>
</td>
<td valign="top" width="109" style="width:109px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">Method</span></p>
</td>
<td valign="top" width="379" style="width:379px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">A synchronous process.</span></p>
</td>
</tr>
<tr style="text-align:left;vertical-align:top;">
<td valign="top" width="120" style="width:120px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext" style="font-weight: bold;">typedef</span></p>
</td>
<td valign="top" width="109" style="width:109px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">Inner Class</span></p>
</td>
<td valign="top" width="379" style="width:379px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">A </span><span class="f_Tabletext" style="font-style: italic;">type</span><span class="f_Tabletext"> or </span><span class="f_Tabletext" style="font-style: italic;">subtype</span><span class="f_Tabletext"> definition.</span></p>
</td>
</tr>
</table>
</div>
<p class="p_SubHeadingL1"><span class="f_SubHeadingL1">Tagged Values</span></p>
<div style="text-align: left; text-indent: 0px; padding: 0px 0px 0px 0px; margin: 5px 0px 5px 13px;"><table cellspacing="0" cellpadding="0" border="0" style="border: none; border-spacing:0px; border-collapse: collapse;">
<tr style="text-align:left;vertical-align:top;">
<td valign="top" width="119" bgcolor="#e3e6ed" style="width:119px; background-color:#e3e6ed; border: solid 1px #000000;"><p class="p_Tableheader"><span class="f_Tableheader">Tag</span></p>
</td>
<td valign="top" width="109" bgcolor="#e3e6ed" style="width:109px; background-color:#e3e6ed; border: solid 1px #000000;"><p class="p_Tableheader"><span class="f_Tableheader">Applies To</span></p>
</td>
<td valign="top" width="379" bgcolor="#e3e6ed" style="width:379px; background-color:#e3e6ed; border: solid 1px #000000;"><p class="p_Tableheader"><span class="f_Tableheader">Corresponds To</span></p>
</td>
</tr>
<tr style="text-align:left;vertical-align:top;">
<td valign="top" width="119" style="width:119px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext" style="font-weight: bold;">isGeneric</span></p>
</td>
<td valign="top" width="109" style="width:109px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">Attribute (port)</span></p>
</td>
<td valign="top" width="379" style="width:379px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">The port declaration in a generic interface.</span></p>
</td>
</tr>
<tr style="text-align:left;vertical-align:top;">
<td valign="top" width="119" style="width:119px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext" style="font-weight: bold;">isSubType</span></p>
</td>
<td valign="top" width="109" style="width:109px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">Inner Class (typedef)</span></p>
</td>
<td valign="top" width="379" style="width:379px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">A subtype definition.</span></p>
</td>
</tr>
<tr style="text-align:left;vertical-align:top;">
<td valign="top" width="119" style="width:119px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext" style="font-weight: bold;">kind</span></p>
</td>
<td valign="top" width="109" style="width:109px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">Attribute (signal)</span></p>
</td>
<td valign="top" width="379" style="width:379px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">The signal kind (e.g. </span><span class="f_Tabletext" style="font-style: italic;">register</span><span class="f_Tabletext">, </span><span class="f_Tabletext" style="font-style: italic;">bus</span><span class="f_Tabletext">).</span></p>
</td>
</tr>
<tr style="text-align:left;vertical-align:top;">
<td valign="top" width="119" style="width:119px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext" style="font-weight: bold;">mode</span></p>
</td>
<td valign="top" width="109" style="width:109px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">Attribute (port)</span></p>
</td>
<td valign="top" width="379" style="width:379px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">The port mode (</span><span class="f_Tabletext" style="font-style: italic;">in</span><span class="f_Tabletext">, </span><span class="f_Tabletext" style="font-style: italic;">out</span><span class="f_Tabletext">, </span><span class="f_Tabletext" style="font-style: italic;">inout, buffer, linkage</span><span class="f_Tabletext">).</span></p>
</td>
</tr>
<tr style="text-align:left;">
<td width="119" style="width:119px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext" style="font-weight: bold;">portmap</span></p>
</td>
<td valign="top" width="109" style="width:109px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">Attribute (part)</span></p>
</td>
<td valign="top" width="379" style="width:379px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">The generic / port map of the component instantiated.</span></p>
</td>
</tr>
<tr style="text-align:left;">
<td width="119" style="width:119px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext" style="font-weight: bold;">sensitivity</span></p>
</td>
<td valign="top" width="109" style="width:109px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">Method (synchronous)</span></p>
</td>
<td valign="top" width="379" style="width:379px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">The sensitivity list of a synchronous process.</span></p>
</td>
</tr>
<tr style="text-align:left;vertical-align:top;">
<td valign="top" width="119" style="width:119px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext" style="font-weight: bold;">type</span></p>
</td>
<td valign="top" width="109" style="width:109px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">Inner Class (typedef)</span></p>
</td>
<td valign="top" width="379" style="width:379px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">The type indication of a type declaration.</span></p>
</td>
</tr>
<tr style="text-align:left;vertical-align:top;">
<td valign="top" width="119" style="width:119px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext" style="font-weight: bold;">typeNameSpace</span></p>
</td>
<td valign="top" width="109" style="width:109px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">Attribute (part)</span></p>
</td>
<td valign="top" width="379" style="width:379px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">The type namespace of the instantiated component.</span></p>
</td>
</tr>
</table>
</div>
<p class="p_SubHeadingL1"><span class="f_SubHeadingL1">VHDL Toolbox Pages</span></p>
<p class="p_BodyText"><span class="f_BodyText">To access the </span><span class="f_UIControl">VHDL</span><span class="f_BodyText"> pages of the Enterprise Architect UML </span><span class="f_UIControl">Toolbox</span><span class="f_BodyText">, select the </span><span class="f_MenuKeyField">More tools | HDL | VHDL Constructs</span><span class="f_BodyText"> menu option. Drag these icons onto a diagram to model a VHDL design.</span></p>
<div style="text-align: left; text-indent: 0px; padding: 0px 0px 0px 0px; margin: 5px 0px 5px 13px;"><table cellspacing="0" cellpadding="0" border="0" style="border: none; border-spacing:0px; border-collapse: collapse;">
<tr style="text-align:left;vertical-align:middle;">
<td valign="middle" width="119" bgcolor="#e3e6ed" style="width:119px; background-color:#e3e6ed; border: solid 1px #000000;"><p class="p_Tableheader"><span class="f_Tableheader">Page</span></p>
</td>
<td valign="middle" width="110" bgcolor="#e3e6ed" style="width:110px; background-color:#e3e6ed; border: solid 1px #000000;"><p class="p_Tableheader"><span class="f_Tableheader">Item</span></p>
</td>
<td valign="middle" width="384" bgcolor="#e3e6ed" style="width:384px; background-color:#e3e6ed; border: solid 1px #000000;"><p class="p_Tableheader"><span class="f_Tableheader">Use To</span></p>
</td>
</tr>
<tr style="text-align:left;vertical-align:middle;">
<td valign="top" width="119" style="width:119px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_UIControl">VHDL</span></p>
</td>
<td valign="top" width="110" style="width:110px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">Architecture</span></p>
</td>
<td valign="middle" width="384" style="width:384px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">Define an architecture to be associated with a VHDL entity.</span></p>
<p class="p_Tabletext"><span class="f_Tabletext">An </span><span class="f_Tabletext" style="font-style: italic;">architecture</span><span class="f_Tabletext">-stereotyped Class element.</span></p>
</td>
</tr>
<tr style="text-align:left;vertical-align:middle;">
<td valign="top" width="119" style="width:119px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_UIControl">&nbsp;</span></p>
</td>
<td valign="top" width="110" style="width:110px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">Entity</span></p>
</td>
<td valign="middle" width="384" style="width:384px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">Define a VHDL entity to contain the Port definitions.</span></p>
<p class="p_Tabletext"><span class="f_Tabletext">An </span><span class="f_Tabletext" style="font-style: italic;">entity</span><span class="f_Tabletext">-stereotyped interface element.</span></p>
</td>
</tr>
<tr style="text-align:left;vertical-align:top;">
<td valign="top" width="119" style="width:119px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_UIControl">&nbsp;</span></p>
</td>
<td valign="top" width="110" style="width:110px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">Enumeration</span></p>
</td>
<td valign="top" width="384" style="width:384px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">Define an Enumerated Type. </span></p>
<p class="p_Tabletext"><span class="f_Tabletext">An </span><span class="f_Tabletext" style="font-style: italic;">enumeration</span><span class="f_Tabletext">-stereotyped enumeration element.</span></p>
</td>
</tr>
<tr style="text-align:left;vertical-align:top;">
<td valign="top" width="119" style="width:119px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_UIControl">&nbsp;</span></p>
</td>
<td valign="top" width="110" style="width:110px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">Struct</span></p>
</td>
<td valign="top" width="384" style="width:384px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">Define a VHDL record.</span></p>
<p class="p_Tabletext"><span class="f_Tabletext">A </span><span class="f_Tabletext" style="font-style: italic;">struct</span><span class="f_Tabletext">-stereotyped Class element.</span></p>
</td>
</tr>
<tr style="text-align:left;vertical-align:top;">
<td valign="top" width="119" style="width:119px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_UIControl">&nbsp;</span></p>
</td>
<td valign="top" width="110" style="width:110px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">Typedef</span></p>
</td>
<td valign="top" width="384" style="width:384px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">Define a VHDL type or subtype</span></p>
<p class="p_Tabletext"><span class="f_Tabletext">A </span><span class="f_Tabletext" style="font-style: italic;">typedef</span><span class="f_Tabletext">-stereotyped Class element.</span></p>
</td>
</tr>
<tr style="text-align:left;vertical-align:middle;">
<td valign="top" width="119" style="width:119px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_UIControl">VHDL Features</span></p>
</td>
<td valign="top" width="110" style="width:110px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">Port</span></p>
</td>
<td valign="middle" width="384" style="width:384px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">Define a VHDL Port.</span></p>
<p class="p_Tabletext"><span class="f_Tabletext">A </span><span class="f_Tabletext" style="font-style: italic;">port-</span><span class="f_Tabletext">stereotyped attribute.</span></p>
</td>
</tr>
<tr style="text-align:left;vertical-align:middle;">
<td valign="top" width="119" style="width:119px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_UIControl">&nbsp;</span></p>
</td>
<td valign="top" width="110" style="width:110px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">Part</span></p>
</td>
<td valign="middle" width="384" style="width:384px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">Define a VHDL component instantiation</span></p>
<p class="p_Tabletext"><span class="f_Tabletext">A </span><span class="f_Tabletext" style="font-style: italic;">part</span><span class="f_Tabletext">-stereotyped attribute.</span></p>
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<td valign="top" width="119" style="width:119px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_UIControl">&nbsp;</span></p>
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<td valign="top" width="110" style="width:110px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">Signal</span></p>
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<td valign="middle" width="384" style="width:384px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">Define a VHDL signal.</span></p>
<p class="p_Tabletext"><span class="f_Tabletext">A </span><span class="f_Tabletext" style="font-style: italic;">signal</span><span class="f_Tabletext">-stereotyped attribute.</span></p>
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<td valign="top" width="119" style="width:119px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_UIControl">&nbsp;</span></p>
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<td valign="top" width="110" style="width:110px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">Procedure</span></p>
<ul style="text-indent: 0px; margin-left: 30px; list-style-position: outside;">
<li><span class="f_Bulletlist1">Concurrent</span></li>
<li><span class="f_Bulletlist1">Sequential</span></li>
<li><span class="f_Bulletlist1">Configuration.</span></li>
</ul>
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<td valign="top" width="384" style="width:384px; border: solid 1px #000000;"><p class="p_Tabletext"><span class="f_Tabletext">Define a VHDL process:</span></p>
<ul style="text-indent: 0px; margin-left: 30px; list-style-position: outside;">
<li><span class="f_Bulletlist1">An </span><span class="f_Bulletlist1" style="font-style: italic;">asynchronous</span><span class="f_Bulletlist1">-stereotyped method</span></li>
<li><span class="f_Bulletlist1">A </span><span class="f_Bulletlist1" style="font-style: italic;">synchronous</span><span class="f_Bulletlist1">-stereotyped method</span></li>
<li><span class="f_Bulletlist1">A </span><span class="f_Bulletlist1" style="font-style: italic;">configuration</span><span class="f_Bulletlist1">-stereotyped method.</span></li>
</ul>
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<p class="p_SeeAlso"><span class="f_SeeAlso">See Also</span></p>
<ul style="text-indent: 0px; margin-left: 30px; list-style-position: outside;">
<li><span class="f_Bulletlist1"><a href="o316.htm">Import Source Code</a></span></li>
<li><span class="f_Bulletlist1"><a href="generatesourcecode.htm">Generate Source Code</a></span></li>
<li><span class="f_Bulletlist1"><a href="vhdl.htm">VHDL Language Options.</a></span></li>
</ul>




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